When the Congress of Industrial Organizations launched “Operation Dixie” in the aftermath of World War II, with the goal not just of organizing unions in the states of the old Confederacy but of ending Jim Crow discrimination, Southern segregationists moved immediately to establish deceptively named “right-to-work” laws.

These measures were designed to make it dramatically harder for workers to organize unions and for labor organizations to advocate for workers on the job site or for social change in their communities and states.

In short order, all the states that had seceded from the Union in order to maintain slavery had laws designed to prevent unions from fighting against segregation. The strategy worked. Southern states have far weaker unions than Northern states, and labor struggles have been far more bitter and violent in the South than in other parts of the country. It was in a right-to-work state, Tennessee, where the Rev. Martin Luther King Jr. was assassinated while supporting the struggle of African-American sanitation workers to organize a union and have it recognized by the city of Memphis.